Sahih Muslim 2972a

'A'isha reported: We the family of Muhammad ﷺ used to spend (the whole) month in which we (did not need to) kindle the fire as (we had nothing to cook) ;
we had only dates and water (to fill our bellies).

حَدَّثَنَا عَمْرٌو النَّاقِدُ، حَدَّثَنَا عَبْدَةُ بْنُ سُلَيْمَانَ، قَالَ وَيَحْيَى بْنُ يَمَانٍ حَدَّثَنَا عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، قَالَتْ إِنْ كُنَّا آلَ مُحَمَّدٍ ﷺ لَنَمْكُثُ شَهْرًا مَا نَسْتَوْقِدُ بِنَارٍ إِنْ هُوَ إِلاَّ التَّمْرُ وَالْمَاءُ .